EP0321681A2 - TV receiver unit with digitally operating stages - Google Patents
TV receiver unit with digitally operating stages Download PDFInfo
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- EP0321681A2 EP0321681A2 EP88118095A EP88118095A EP0321681A2 EP 0321681 A2 EP0321681 A2 EP 0321681A2 EP 88118095 A EP88118095 A EP 88118095A EP 88118095 A EP88118095 A EP 88118095A EP 0321681 A2 EP0321681 A2 EP 0321681A2
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- 239000002131 composite material Substances 0.000 claims abstract 2
- 230000010365 information processing Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
Definitions
- the other A / D converter is located at the beginning of the audio channel and, unlike the one mentioned above, which is a flash A / D converter, is usually a delta-sigma A / D converter.
- the object of the invention defined in the claims is therefore to provide a circuit principle for television receiving parts with at least one interface between analog and digital signal processing, which allows a much simpler adaptation to different television standards and in which the expenditure on A / D converters is reduced.
- the main idea on which the invention is based is to use a single A / D converter at the output of the intermediate frequency stage, ie where the still analog signal is in a frequency range between approximately 30 MHz and 40 MHz, the clock signal of which has a frequency, which is approximately twice the bandwidth of the received signal, e.g. a frequency. of about 20 MHz.
- the division into a channel processing the video information, the video channel, and a channel processing the audio information the audio channel.
- the separate audio channel A / D converter can thus be dispensed with, which means the saving of an entire integrated circuit in a system currently available on the market.
- the figure shows that part of a television receiver or a video recorder which is affected by the invention and which is referred to as a television reception part.
- the antenna signal al is supplied to the tuner and mixer tu implemented in any known and customary technique with a downstream intermediate frequency stage z, at whose output the signal v containing the video and audio information occurs, as mentioned, in the intermediate frequency position.
- This is converted by means of the single A / D converter aw, whose clock signal t has a frequency of approximately 20 MHz, into a digital signal whose frequency band is between approximately 1 MHz and 9 MHz.
- the clock signal t is generated by the clock generator tg. There is therefore only the only interface s between analog and digital processing.
- the output signal of the A / D converter aw feeds the video information processing channel vk, called video channel for short, and the audio information processing channel ak, called audio channel for short.
- the video channel contains vk on the input side, the bandpass filter bp, whose pass band is between 1 MHz and 6 MHz and which on the one hand feeds directly and on the other hand via the 90 ° phase shifter ps the first stage b1, briefly called the first amount generator, from its two input signals.
- the digital color-picture-blanking-synchronous signal mixture fb in short the digital FBAS signal, occurs at its output.
- the audio channel ak contains the quadrature mixer qm, in which the two mixed signals have the same fixed frequency, which is dependent on the television standard and is between 7 MHz and 7.5 MHz, and which consists of the two multipliers shown m1, m2, one of which is the digital one Sinus signal ss and the other the digital cosine signal cs are supplied, which are also generated by the clock generator tg.
- Each of the two output signals of the quadrature mixer qm is converted by means of one of the two decimators d1, d2 from the high frequency of the clock signal t on the input side to the lower frequency of the scanning signal d suitable for further processing, which comes from the clock generator tg.
- the respective output of the two decimators d1, d2 leads to the two inputs of the second stage b2, briefly called the second magnifier, from their input signals, and to the two inputs of the stage wb forming the angle between them, briefly called the angular generator .
- the angle generator wb is followed by the differentiating stage dt, at the output of which the frequency-demodulated audio signal fa can be removed when one is received.
- the amplitude-demodulated audio signal aa can be removed if one is received.
- the audio channel ak has to be provided accordingly several times.
- the two amount formers b1, b2 and the angle generator wb are preferably circuits which operate according to the CORDIC technology, cf. "IRE Transaction on Electronic Computers", 1959, pages 330 to 334.
- the further circuits following the two amount formers b1, b2 and the differentiating stage dt are of the type customary for digital signal processing in television reception parts.
- FIG. 2 shows an advantageous development of the arrangement according to FIG. 1 for the case that the frequencies at the output of the intermediate frequency stage z are substantially higher than the frequency of the clock signal t of the A / D converter aw. Since in this case very high demands are placed on its accuracy, because temporal fluctuations of the sample time, the so-called aperture jitter, lead to uncorrectable distortions of the A / D-converted signal, there is between the output of the intermediate frequency stage z and the input of the A / D converter aw the mixing stage ms is provided, to which the mixed signal tm is supplied, the Frequency is an integer multiple of the frequency of the clock signal t.
- the clock generator tg ' also generates the mixed signal tm.
- FIG. 3 shows a further development of the arrangement according to FIG. 2 for the case in which the signal at the output of the intermediate frequency stage z (already) is a band-limited signal.
- the mixed signal tm according to FIG. 2 can advantageously be the square-wave signal tm 'corresponding to FIG. 3, from which the clock signal t is advantageously obtained by frequency division.
- the clock generator tg '' of Fig. 3 contains a frequency divider circuit in this case.
- Fig. 3 also shows that it may be useful to arrange the low-pass filter tp between the mixer ms and the A / D converter aw, with which higher-frequency signal components at the output of the mixer ms can be suppressed.
- the cut-off frequency of the low-pass filter tp should be selected accordingly if necessary.
- the setting to the different television standards and their standard-related numerical values is done with the ground connection exclusively on the digital side of the signal processing and is therefore much easier to implement than with the usual television reception parts, where the adaptation to the standard numerical values still have to be done on the side of the analog signal processing.
- the invention is preferably implemented by means of integrated circuits, the most suitable special technology being selected for the individual parts, both as regards the pure manufacturing technology of the semiconductor crystal and the respective basic circuit technology.
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- Engineering & Computer Science (AREA)
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- Circuits Of Receivers In General (AREA)
- Analogue/Digital Conversion (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
Die Priorität der Anmeldung P 37 43 727.5 vom 23. Dezember 1987 in der Bundesrepublik Deutschland wird beansprucht.The priority of application P 37 43 727.5 dated December 23, 1987 in the Federal Republic of Germany is claimed.
Bei den heute üblichen sogenannten digitalen Fernsehempfängern sind im allgemeinen mindestens zwei A/D-Wandler (= Analog/Digital-Wandler) vorgesehen. Der eine dient zur A/D-Wandlung des Videosignals und ist üblicherweise hinter der sogenannten Tonfalle angeordnet, mit der das Tonträgersignal aus dem übrigen Signal unterdrückt wird. Dieser A/D-Wandler wird an einem Abtastsignal betrieben, dessen Frequenz meist das Vierfache der Farbträgerfrequenz ist.In today's so-called digital television receivers, at least two A / D converters (= analog / digital converters) are generally provided. One is used for A / D conversion of the video signal and is usually arranged behind the so-called sound trap, with which the sound carrier signal is suppressed from the rest of the signal. This A / D converter is operated on a scanning signal, the frequency of which is usually four times the color carrier frequency.
Der andere A/D-Wandler ist zu Beginn des Audiokanals angeordnet und ist im Gegensatz zum oben erwähnten, der ein Flash-A/D-Wandler ist, meist ein Delta-Sigma-A/D-Wandler.The other A / D converter is located at the beginning of the audio channel and, unlike the one mentioned above, which is a flash A / D converter, is usually a delta-sigma A / D converter.
Bei der Weiterentwicklung und Verfeinerung des heute üblichen Prinzips eines digitalen Fernsehempfängers hat sich gezeigt, daß für jede der verschiedenen heute üblichen, aber auch für die zukünftig zu erwartenden Fernsehstandards entsprechend zugeschnittene und dimensionierte Teilschaltungen erforderlich sind, die zu einer Vielzahl verschiedener Typen von integrierten Schaltungen führen. Dies ist insbesondere im Hinblick auf die Massenfertigung von integrierten Schaltungen ungünstig.In the further development and refinement of the principle of a digital television receiver that is common today, it has been shown that for each of the various subcircuits that are customary today, but also for the television standards to be expected in the future, correspondingly tailored and dimensioned subcircuits are required, which lead to a large number of different types of integrated circuits . This is especially with regard unfavorable to the mass production of integrated circuits.
Der in den Patentansprüchen definierten Erfindung liegt daher die Aufgabe zugrunde, ein Schaltungsprinzip für Fernsehempfangsteile mit mindestens einer Schnittstelle zwischen analoger und digitaler Signalverarbeitung anzugeben, das eine wesentlich einfachere Anpassung an unterschiedliche Fernsehstandards erlaubt und bei dem der Aufwand an A/D-Wandlern reduziert ist.The object of the invention defined in the claims is therefore to provide a circuit principle for television receiving parts with at least one interface between analog and digital signal processing, which allows a much simpler adaptation to different television standards and in which the expenditure on A / D converters is reduced.
Der der Erfindung zugrundeliegende Hauptgedanke besteht darin, schon am Ausgang der Zwischenfrequenzstufe, also dort, wo das noch analoge Signal in einem Frequenzbereich zwischen ca. 30 MHz und 40 MHz liegt, einen einzigen A/D-Wandler einzusetzen, dessen Taktsignal eine Frequenz hat, die etwa gleich dem Doppelten der Bandbreite des empfangenen Signals ist, also z.B. eine Frequenz. von etwa 20 MHz . Hinter diesem A/D-Wandler erfolgt die Aufteilung in einen die Videoinformation verarbeitenden Kanal, den Videokanal, und in einen die Audioinformation verarbeitenden Kanal, den Audiokanal. Gegenüber der bisher üblichen und oben geschilderten Lösung kann somit der separate Audiokanal-A/D-Wandler entfallen, was bei einem gegenwärtig marktgängigen System die Einsparung einer ganzen integrierten Schaltung bedeutet.The main idea on which the invention is based is to use a single A / D converter at the output of the intermediate frequency stage, ie where the still analog signal is in a frequency range between approximately 30 MHz and 40 MHz, the clock signal of which has a frequency, which is approximately twice the bandwidth of the received signal, e.g. a frequency. of about 20 MHz. After this A / D converter, the division into a channel processing the video information, the video channel, and a channel processing the audio information, the audio channel. Compared to the previously common solution described above, the separate audio channel A / D converter can thus be dispensed with, which means the saving of an entire integrated circuit in a system currently available on the market.
Die Erfindung wird nun anhand der Figuren der Zeichnung näher erläutert.
- Fig. 1 zeigt schematisch das Blockschaltbild eines Ausführungsbeispiels der Erfindung,
- Fig. 2 zeigt schematisch ausschnittsweise das Blockschaltbild einer vorteilhaften Weiterbildung und
- Fig. 3 zeigt schematisch ausschnittsweise das Blockschaltbild einer weiteren Weiterbildung der Erfindung.
- 1 schematically shows the block diagram of an embodiment of the invention,
- Fig. 2 shows a schematic section of the block diagram of an advantageous development and
- Fig. 3 shows a schematic section of the block diagram of a further development of the invention.
Die Fig. zeigt denjenigen Teil eines Fernsehempfängers oder eines Videorecorders, der von der Erfindung betroffen ist und der als Fernsehempfangsteil bezeichnet ist. Wie üblich ist das Antennensignal al dem in irgendeiner bekannten und üblichen Technik realisierten Tuner und Mischer tu mit nachgeschalteter Zwischenfrequenzstufe z zugeführt, an deren Ausgang das die Video- und die Audio-Information enthaltende Signal v wie erwähnt in Zwischenfrequenzlage auftritt. Dieses wird mittels des einzigen A/D-Wandlers aw, dessen Taktsignal t eine Frequenz von etwa 20 MHz hat, in ein Digitalsignal überführt, dessen Frequenzband zwischen etwa 1 MHz und 9 MHz liegt. Das Taktsignal t wird vom Taktgenerator tg erzeugt. Es liegt somit nur die einzige Schnittstelle s zwischen analoger und digitaler Verarbeitung vor.The figure shows that part of a television receiver or a video recorder which is affected by the invention and which is referred to as a television reception part. As usual, the antenna signal al is supplied to the tuner and mixer tu implemented in any known and customary technique with a downstream intermediate frequency stage z, at whose output the signal v containing the video and audio information occurs, as mentioned, in the intermediate frequency position. This is converted by means of the single A / D converter aw, whose clock signal t has a frequency of approximately 20 MHz, into a digital signal whose frequency band is between approximately 1 MHz and 9 MHz. The clock signal t is generated by the clock generator tg. There is therefore only the only interface s between analog and digital processing.
Das Ausgangssignal des A/D-Wandlers aw speist den Videoinformation-Verarbeitungskanal vk, kurz Videokanal genannt, und den Audioinformation-Verarbeitungskanal ak, kurz Audiokanal genannt. Der Videokanal vk enthält eingangsseitig den Bandpaß bp, dessen Durchlaßband zwischen 1 MHz und 6 MHz liegt und der einerseits direkt und andererseits über den 90°-Phasenschieber ps die aus ihren beiden Eingangssignalen den Betrag bildende erste Stufe b1, kurz erster Betragsbildner genannt, speist. An deren Ausgang tritt das digitale Farb-Bild-Austast-Synchron-Signalgemisch fb, also kurz das digitale FBAS-Signal, auf.The output signal of the A / D converter aw feeds the video information processing channel vk, called video channel for short, and the audio information processing channel ak, called audio channel for short. The video channel contains vk on the input side, the bandpass filter bp, whose pass band is between 1 MHz and 6 MHz and which on the one hand feeds directly and on the other hand via the 90 ° phase shifter ps the first stage b1, briefly called the first amount generator, from its two input signals. The digital color-picture-blanking-synchronous signal mixture fb, in short the digital FBAS signal, occurs at its output.
Der Audiokanal ak enthält eingangsseitig den Quadraturmischer qm, bei dem die beiden Mischsignale dieselbe fernsehstandard-abhängige feste Frequenz, die zwischen 7 MHz und 7,5 MHz liegt, haben und der aus den beiden gezeigten Multiplizierern m1, m2 besteht, wobei dem einen das digitale Sinussignal ss und dem anderen das digitale Cosinussignal cs zugeführt sind, die ebenfalls vom Taktgenerator tg erzeugt werden.On the input side, the audio channel ak contains the quadrature mixer qm, in which the two mixed signals have the same fixed frequency, which is dependent on the television standard and is between 7 MHz and 7.5 MHz, and which consists of the two multipliers shown m1, m2, one of which is the digital one Sinus signal ss and the other the digital cosine signal cs are supplied, which are also generated by the clock generator tg.
Jedes der beiden Ausgangssignale des Quadraturmischers qm ist mittels eines der beiden Dezimierer d1, d2 von der eingangsseitigen hohen Frequenz des Taktsignals t auf die zur Weiterverarbeitung geeignete niedrigere Frequenz des Abtastsignals d umgesetzt, das aus dem Taktgenerator tg stammt.Each of the two output signals of the quadrature mixer qm is converted by means of one of the two decimators d1, d2 from the high frequency of the clock signal t on the input side to the lower frequency of the scanning signal d suitable for further processing, which comes from the clock generator tg.
Der jeweilige Ausgang der beiden Dezimierer d1, d2 führt zu den beiden Eingängen der aus ihren Eingangssignalen den Betrag bildenden zweiten Stufe b2, kurz zweiter Betragsbildner genannt, und zu den beiden Eingängen der aus ihren Eingangssignalen den dazwischen auftretenden Winkel bildenden Stufe wb, kurz Winkelbildner genannt.The respective output of the two decimators d1, d2 leads to the two inputs of the second stage b2, briefly called the second magnifier, from their input signals, and to the two inputs of the stage wb forming the angle between them, briefly called the angular generator .
Dem Winkelbildner wb ist die Differenzierstufe dt nachgeschaltet, an deren Ausgang das frequenzdemodulierte Audiosignal fa abnehmbar ist, wenn ein solches empfangen wird. Am Ausgang des zweiten Betragsbildners b2 ist das amplitudendemodulierte Audiosignal aa abnehmbar, wenn ein solches empfangen wird. Bei Standards mit mehr als einem Tonträger ist der Audiokanal ak entsprechend mehrfach vorzusehen. Die beiden Betragsbildner b1, b2 und der Winkelbildner wb sind bevorzugt Schaltungen, die nach der CORDIC-Technik arbeiten, vgl. "IRE Transaction on Electronic Computers", 1959, Seiten 330 bis 334.The angle generator wb is followed by the differentiating stage dt, at the output of which the frequency-demodulated audio signal fa can be removed when one is received. At the output of the second absolute value generator b2, the amplitude-demodulated audio signal aa can be removed if one is received. For standards with more than one sound carrier, the audio channel ak has to be provided accordingly several times. The two amount formers b1, b2 and the angle generator wb are preferably circuits which operate according to the CORDIC technology, cf. "IRE Transaction on Electronic Computers", 1959, pages 330 to 334.
Die weiteren auf die beiden Betragsbildner b1, b2 bzw. die Differenzierstufe dt folgenden Schaltungen sind von für die digitale Signalverarbeitung in Fernsehempfangsteilen üblicher Art.The further circuits following the two amount formers b1, b2 and the differentiating stage dt are of the type customary for digital signal processing in television reception parts.
In Fig. 2 ist eine vorteilhafte Weiterbildung der Anordnung nach Fig. 1 für den Fall gezeigt, daß die Frequenzen am Ausgang der Zwischenfrequenzstufe z wesentlich höher sind als die Frequenz des Taktsignals t des A/D-Wandlers aw. Da in diesem Fall sehr hohe Anforderungen an dessen Genauigkeit gestellt werden, weil zeitliche Schwankungen des Sample-Zeitpunkts, das sogenannte Aperturjittern, zu nicht korrigierbaren Verzerrungen des A/D-gewandelten Signals führen, ist zwischen dem Ausgang der Zwischenfrequenzstufe z und dem Eingang des A/D-Wandlers aw die Mischstufe ms vorgesehen, der das Mischsignal tm zugeführt ist, dessen Frequenz ein ganzzahliges Vielfaches der Frequenz des Taktsignals t ist.FIG. 2 shows an advantageous development of the arrangement according to FIG. 1 for the case that the frequencies at the output of the intermediate frequency stage z are substantially higher than the frequency of the clock signal t of the A / D converter aw. Since in this case very high demands are placed on its accuracy, because temporal fluctuations of the sample time, the so-called aperture jitter, lead to uncorrectable distortions of the A / D-converted signal, there is between the output of the intermediate frequency stage z and the input of the A / D converter aw the mixing stage ms is provided, to which the mixed signal tm is supplied, the Frequency is an integer multiple of the frequency of the clock signal t.
Durch die letztgenannte Maßnahme läßt sich erreichen, daß es bei der A/D-Wandlung nicht zu Aliasing-Effekten kommt. In Fig. 2 erzeugt der Taktgenerator tg′ auch das Mischsignal tm.With the latter measure it can be achieved that there are no aliasing effects in the A / D conversion. In Fig. 2, the clock generator tg 'also generates the mixed signal tm.
In Fig. 3 ist eine Weiterbildung der Anordnung nach Fig. 2 für den Fall gezeigt, daß das Signal am Ausgang der Zwischenfrequenzstufe z (schon) ein bandbegrenztes Signal ist. Dann kann das Mischsignal tm nach Fig. 2 vorteilhaft das Rechtecksignal tm′ entsprechend Fig. 3 sein, aus dem zweckmäßigerweise durch Frequenzteilung das Taktsignal t gewonnen wird. Der Taktgenerator tg′′ von Fig. 3 enthält in diesem Fall eine Frequenzteilerschaltung.3 shows a further development of the arrangement according to FIG. 2 for the case in which the signal at the output of the intermediate frequency stage z (already) is a band-limited signal. Then the mixed signal tm according to FIG. 2 can advantageously be the square-wave signal tm 'corresponding to FIG. 3, from which the clock signal t is advantageously obtained by frequency division. The clock generator tg '' of Fig. 3 contains a frequency divider circuit in this case.
Fig. 3 zeigt ferner, daß es zweckmäßig sein kann, zwischen der Mischstufe ms und dem A/D-Wandler aw das Tiefpaßfilter tp anzuordnen, mit dem höherfrequente Signalanteile am Ausgang der Mischstufe ms unterdrückbar sind. Die Grenzfrequenz des Tiefpaßfilters tp ist im Bedarfsfall entsprechend zu wählen.Fig. 3 also shows that it may be useful to arrange the low-pass filter tp between the mixer ms and the A / D converter aw, with which higher-frequency signal components at the output of the mixer ms can be suppressed. The cut-off frequency of the low-pass filter tp should be selected accordingly if necessary.
Die Einstellung auf die verschiedenen Fernsehstandards und deren standardbedingte Zahlenwerte erfolgt bei der Erdindung ausschließlich auf der digitalen Seite der Signalverarbeitung und ist somit wesentlich leichter zu realisieren als bei den heute üblichen Fernsehempfangsteilen, wo die Anpassung an die standardbedingten Zahlenwerte zum Teil noch auf der Seite der analogen Signalverarbeitung erfolgen muß.The setting to the different television standards and their standard-related numerical values is done with the ground connection exclusively on the digital side of the signal processing and is therefore much easier to implement than with the usual television reception parts, where the adaptation to the standard numerical values still have to be done on the side of the analog signal processing.
Die Erfindung wird bevorzugt mittels integrierter Schaltungen realisiert, wobei für die einzelnen Teile die am besten geeignete spezielle Technologie gewählt wird, und zwar sowohl was die reine Herstellungstechnologie des Halbleiterkristalls als auch die jeweilige prinzipielle Schaltungstechnik betrifft.The invention is preferably implemented by means of integrated circuits, the most suitable special technology being selected for the individual parts, both as regards the pure manufacturing technology of the semiconductor crystal and the respective basic circuit technology.
Claims (4)
- es ist eine einzige Schnittstelle (s) mit einem einzigen A/D-Wandler (aw) vorgesehen, die direkt nach dem Ausgang der üblichen Zwischenfrequenzstufe (z) angeordnet ist,
- das Taktsignal des A/D-Wandlers (aw) hat eine Frequenz, die ungefähr gleich dem Doppelten der Bandbreite des empfangenen Signals ist,
- dessen Ausgangssignal speist einen Audioinformation-Verarbeitungskanal (= Audiokanal) (ak) und einen Videoinformation-Verarbeitungskanal (= Videokanal) (vk),
- dieser enthält eingangsseitig einen Bandpaß (bp), dessen Durchlaßband zwischen 1 MHz und 6 MHz liegt und der einerseits direkt und andererseits über einen 90°-Phasenschieber (ps) eine aus ihren beiden Eingangssignalen den Betrag bildende erste Stufe (= erster Betragsbildner) (b1) speist, an deren Ausgang das digitale FBAS-Signal (fb) auftritt, und
- der Audiokanal (ak) enthält eingangsseitig einen Quadraturmischer (qm), bei dem die Mischsignale dieselbe fernsehstandard-abhängige feste Frequenz, die zwischen l7 und 7,5 MHz liegt, haben und bei dem jedes von dessen beiden Ausgangssignalen über einen Dezimierer (d1, d2) zu den beiden Eingängen einer aus ihren Eingangssignalen den Betrag bildenden zweiten Stufe (= zweiter Betragsbildner) (b2) und zu den beiden Eingängen eines aus ihren Eingangssignalen den dazwischen auftretenden Winkel bildenden Stufe (= Winkelbildner) (wb) geführt sind, wobei am Ausgang des Winkelbildners (b2) über eine Differenzierstufe (dt) das frequenzdemodulierte Audiosignal (af) abnehmbar ist, wenn ein solches empfangen wird, und am Ausgang des zweiten Betragsbildners (b2) das amplitudendemodulierte Audiosignal (aa) abnehmbar ist, wenn ein solches empfangen wird.1. TV reception section with at least one interface between analog and digital stages, with the following features:
a single interface (s) with a single A / D converter (aw) is provided, which is arranged directly after the output of the usual intermediate frequency stage (z),
the clock signal of the A / D converter (aw) has a frequency which is approximately twice the bandwidth of the received signal,
the output signal feeds an audio information processing channel (= audio channel) (ak) and a video information processing channel (= video channel) (vk),
- This contains a bandpass (bp) on the input side, whose pass band is between 1 MHz and 6 MHz and which, on the one hand, directly and on the other hand via a 90 ° phase shifter (ps) has a first stage (= first amount generator) that forms the amount from its two input signals (= b1) feeds, at whose output the digital composite signal (fb) occurs, and
- On the input side, the audio channel (ak) contains a quadrature mixer (qm), in which the mixed signals have the same fixed frequency, depending on the television standard, between l7 and 7.5 MHz, and in which each of its two output signals via a decimator (d1, d2) to the two inputs of a second stage (= second amount generator) (b2) forming the amount from their input signals and to the two inputs a stage (= angle generator) (wb) forming the angle occurring between them is guided from its input signals, the frequency-demodulated audio signal (af) being removable at the output of the angle generator (b2) via a differentiating stage (dt) when such is received, and at the output of the second absolute value generator (b2) the amplitude-demodulated audio signal (aa) can be removed if one is received.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108754 CN1011280B (en) | 1987-12-23 | 1988-12-23 | Tv receiver parts with digitizer |
| JP63325741A JP2561336B2 (en) | 1987-12-23 | 1988-12-23 | Television receiver with digital processing stage |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873743727 DE3743727A1 (en) | 1987-12-23 | 1987-12-23 | TELEVISION RECEIVER WITH DIGITAL WORKING LEVELS |
| DE3743727 | 1987-12-23 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0321681A2 true EP0321681A2 (en) | 1989-06-28 |
| EP0321681A3 EP0321681A3 (en) | 1991-07-17 |
| EP0321681B1 EP0321681B1 (en) | 1993-12-29 |
Family
ID=6343373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88118095A Expired - Lifetime EP0321681B1 (en) | 1987-12-23 | 1988-10-31 | TV receiver unit with digitally operating stages |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4901151A (en) |
| EP (1) | EP0321681B1 (en) |
| DE (2) | DE3743727A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0529183A2 (en) * | 1991-08-24 | 1993-03-03 | Blaupunkt-Werke GmbH | Car radio |
| EP0584847A1 (en) * | 1992-08-11 | 1994-03-02 | Koninklijke KPN N.V. | Method for digitally coding a composite signal and system therefor |
| EP0683608A2 (en) * | 1994-05-20 | 1995-11-22 | Robert Bosch Gmbh | Device for the digital demodulation of the picture and sound signal of a television signal |
| EP0683607A2 (en) * | 1994-05-20 | 1995-11-22 | Robert Bosch Gmbh | Device for processing an analog television signal with real valves |
| EP0683609A2 (en) * | 1994-05-20 | 1995-11-22 | Robert Bosch Gmbh | Device for the digital demodulation of the picture- and sound signals of a television signal |
| EP0727878A2 (en) * | 1995-01-23 | 1996-08-21 | THOMSON multimedia S.A. | Circuit for A/D conversion of a video RF or IF signal |
| EP0744865A2 (en) * | 1995-05-23 | 1996-11-27 | THOMSON multimedia | Method for digitising a signal at intermediate frequency particularly a television signal, and circuit for implementing the same |
| FR2735316A1 (en) * | 1995-06-12 | 1996-12-13 | Thomson Multimedia Sa | METHOD FOR DIGITIZING FI VIDEO SIGNALS AND DEVICE FOR CARRYING OUT SAID METHOD |
| US5812077A (en) * | 1995-01-23 | 1998-09-22 | Thomson Multimedia S.A. | Circuit for A/D conversion of a video RF or IF signal |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3784946D1 (en) * | 1987-11-06 | 1993-04-22 | Itt Ind Gmbh Deutsche | SOUND CHANNEL CIRCUIT FOR DIGITAL TELEVISION RECEIVERS. |
| DE3886740D1 (en) * | 1988-06-07 | 1994-02-10 | Itt Ind Gmbh Deutsche | Digital de-emphasis circuit. |
| EP0349660B1 (en) * | 1988-07-02 | 1993-10-06 | Deutsche ITT Industries GmbH | Frequency conversion circuit for a television channel |
| DE4004631A1 (en) * | 1990-02-15 | 1991-08-22 | Philips Patentverwaltung | TELEVISION RECEIVER |
| NL9002489A (en) * | 1990-11-15 | 1992-06-01 | Philips Nv | RECEIVER. |
| US5430890A (en) * | 1992-11-20 | 1995-07-04 | Blaupunkt-Werke Gmbh | Radio receiver for mobile reception with sampling rate oscillator frequency being an integer-number multiple of reference oscillation frequency |
| US6118499A (en) * | 1997-05-19 | 2000-09-12 | Mitsubishi Denki Kabushiki Kaisha | Digital television signal receiver |
| KR100638138B1 (en) * | 2005-05-24 | 2006-10-24 | 주식회사 픽스트리 | A hardware apparatus having video/audio encoding function and multiplexing function, and method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502078A (en) * | 1982-02-22 | 1985-02-26 | Rca Corporation | Digital television receivers |
| EP0204849A1 (en) * | 1985-06-01 | 1986-12-17 | Deutsche ITT Industries GmbH | Circuit arrangement for filtering and demodulating a frequency-modulated signal with at least one sound signal |
| EP0237590A1 (en) * | 1986-03-15 | 1987-09-23 | Deutsche ITT Industries GmbH | Control circuit for controlling two signals out of phase by about 90o |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3569320D1 (en) * | 1985-08-27 | 1989-05-11 | Itt Ind Gmbh Deutsche | Frequency conversion of a hf signal transmitted to a colour television receiver |
| EP0213222B1 (en) * | 1985-08-27 | 1989-03-29 | Deutsche ITT Industries GmbH | Television sound receiving circuit for at least one audio channel contained in a hf signal |
| KR880014813A (en) * | 1987-05-20 | 1988-12-24 | 이우에 사또시 | PLL Image Detection Circuit |
-
1987
- 1987-12-23 DE DE19873743727 patent/DE3743727A1/en not_active Withdrawn
-
1988
- 1988-10-31 DE DE88118095T patent/DE3886717D1/en not_active Expired - Lifetime
- 1988-10-31 EP EP88118095A patent/EP0321681B1/en not_active Expired - Lifetime
- 1988-12-22 US US07/288,550 patent/US4901151A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502078A (en) * | 1982-02-22 | 1985-02-26 | Rca Corporation | Digital television receivers |
| EP0204849A1 (en) * | 1985-06-01 | 1986-12-17 | Deutsche ITT Industries GmbH | Circuit arrangement for filtering and demodulating a frequency-modulated signal with at least one sound signal |
| EP0237590A1 (en) * | 1986-03-15 | 1987-09-23 | Deutsche ITT Industries GmbH | Control circuit for controlling two signals out of phase by about 90o |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0529183A2 (en) * | 1991-08-24 | 1993-03-03 | Blaupunkt-Werke GmbH | Car radio |
| EP0529183A3 (en) * | 1991-08-24 | 1993-07-07 | Blaupunkt-Werke Gmbh | Car radio |
| EP0584847A1 (en) * | 1992-08-11 | 1994-03-02 | Koninklijke KPN N.V. | Method for digitally coding a composite signal and system therefor |
| US5416525A (en) * | 1992-08-11 | 1995-05-16 | Koninklijke Ptt Nederland N.V. | Method and apparatus for digitally coding and decoding a composite signal, containing baseband and out-of-band signals using relatively few bits and yielding a decoded out-of-band signal having increased quality |
| US5541672A (en) * | 1994-05-20 | 1996-07-30 | Ant Nachrichtentechnik Gmbh | Device for digital demodulation of video and audio elements of television signal |
| US5568206A (en) * | 1994-05-20 | 1996-10-22 | Ant Nachrichtentechnik Gmbh | Device for processing modulated rail analog television signal |
| EP0683609A2 (en) * | 1994-05-20 | 1995-11-22 | Robert Bosch Gmbh | Device for the digital demodulation of the picture- and sound signals of a television signal |
| EP0683609A3 (en) * | 1994-05-20 | 1996-01-03 | Ant Nachrichtentech | |
| EP0683608A3 (en) * | 1994-05-20 | 1996-01-03 | Ant Nachrichtentech | |
| EP0683607A3 (en) * | 1994-05-20 | 1996-01-03 | Ant Nachrichtentech | |
| EP0683608A2 (en) * | 1994-05-20 | 1995-11-22 | Robert Bosch Gmbh | Device for the digital demodulation of the picture and sound signal of a television signal |
| EP0683607A2 (en) * | 1994-05-20 | 1995-11-22 | Robert Bosch Gmbh | Device for processing an analog television signal with real valves |
| EP0727878A3 (en) * | 1995-01-23 | 1996-10-30 | Thomson Multimedia Sa | Circuit for A/D conversion of a video RF or IF signal |
| EP0727878A2 (en) * | 1995-01-23 | 1996-08-21 | THOMSON multimedia S.A. | Circuit for A/D conversion of a video RF or IF signal |
| US5812077A (en) * | 1995-01-23 | 1998-09-22 | Thomson Multimedia S.A. | Circuit for A/D conversion of a video RF or IF signal |
| EP0744865A2 (en) * | 1995-05-23 | 1996-11-27 | THOMSON multimedia | Method for digitising a signal at intermediate frequency particularly a television signal, and circuit for implementing the same |
| FR2734681A1 (en) * | 1995-05-23 | 1996-11-29 | Thomson Multimedia Sa | PROCESS FOR DIGITIZING AN INTERMEDIATE FREQUENCY SIGNAL IF, IN PARTICULAR TELEVISION, AND CIRCUIT FOR IMPLEMENTING THIS PROCEDURE |
| EP0744865A3 (en) * | 1995-05-23 | 1996-12-04 | THOMSON multimedia | Method for digitising a signal at intermediate frequency particularly a television signal, and circuit for implementing the same |
| US5748262A (en) * | 1995-05-23 | 1998-05-05 | Thomson Multimedia S.A. | Method of digitization of intermediate frequency signals in particular television signals, and device for implementation of the method |
| FR2735316A1 (en) * | 1995-06-12 | 1996-12-13 | Thomson Multimedia Sa | METHOD FOR DIGITIZING FI VIDEO SIGNALS AND DEVICE FOR CARRYING OUT SAID METHOD |
| EP0749237A1 (en) * | 1995-06-12 | 1996-12-18 | THOMSON multimedia S.A. | Method for digitising video signals at intermediate frequency and apparatus for implementing the same |
| US5831689A (en) * | 1995-06-12 | 1998-11-03 | Thomson Multimedia S.A. | Method of digitization of intermediate frequency video signals and device for implementation of the method |
Also Published As
| Publication number | Publication date |
|---|---|
| US4901151A (en) | 1990-02-13 |
| DE3886717D1 (en) | 1994-02-10 |
| EP0321681A3 (en) | 1991-07-17 |
| EP0321681B1 (en) | 1993-12-29 |
| DE3743727A1 (en) | 1989-07-13 |
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